+ mm-convert-do_huge_pmd_anonymous_page-to-huge_zero_folio.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm: convert do_huge_pmd_anonymous_page to huge_zero_folio
has been added to the -mm mm-unstable branch.  Its filename is
     mm-convert-do_huge_pmd_anonymous_page-to-huge_zero_folio.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-convert-do_huge_pmd_anonymous_page-to-huge_zero_folio.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: mm: convert do_huge_pmd_anonymous_page to huge_zero_folio
Date: Tue, 26 Mar 2024 20:28:26 +0000

Use folios more widely.

Link: https://lkml.kernel.org/r/20240326202833.523759-7-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/huge_memory.c |   23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

--- a/mm/huge_memory.c~mm-convert-do_huge_pmd_anonymous_page-to-huge_zero_folio
+++ a/mm/huge_memory.c
@@ -971,14 +971,14 @@ gfp_t vma_thp_gfp_mask(struct vm_area_st
 }
 
 /* Caller must hold page table lock. */
-static void set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm,
+static void set_huge_zero_folio(pgtable_t pgtable, struct mm_struct *mm,
 		struct vm_area_struct *vma, unsigned long haddr, pmd_t *pmd,
-		struct page *zero_page)
+		struct folio *zero_folio)
 {
 	pmd_t entry;
 	if (!pmd_none(*pmd))
 		return;
-	entry = mk_pmd(zero_page, vma->vm_page_prot);
+	entry = mk_pmd(&zero_folio->page, vma->vm_page_prot);
 	entry = pmd_mkhuge(entry);
 	pgtable_trans_huge_deposit(mm, pmd, pgtable);
 	set_pmd_at(mm, haddr, pmd, entry);
@@ -1002,13 +1002,14 @@ vm_fault_t do_huge_pmd_anonymous_page(st
 			!mm_forbids_zeropage(vma->vm_mm) &&
 			transparent_hugepage_use_zero_page()) {
 		pgtable_t pgtable;
-		struct page *zero_page;
+		struct folio *zero_folio;
 		vm_fault_t ret;
+
 		pgtable = pte_alloc_one(vma->vm_mm);
 		if (unlikely(!pgtable))
 			return VM_FAULT_OOM;
-		zero_page = mm_get_huge_zero_page(vma->vm_mm);
-		if (unlikely(!zero_page)) {
+		zero_folio = mm_get_huge_zero_folio(vma->vm_mm);
+		if (unlikely(!zero_folio)) {
 			pte_free(vma->vm_mm, pgtable);
 			count_vm_event(THP_FAULT_FALLBACK);
 			return VM_FAULT_FALLBACK;
@@ -1026,8 +1027,8 @@ vm_fault_t do_huge_pmd_anonymous_page(st
 				ret = handle_userfault(vmf, VM_UFFD_MISSING);
 				VM_BUG_ON(ret & VM_FAULT_FALLBACK);
 			} else {
-				set_huge_zero_page(pgtable, vma->vm_mm, vma,
-						   haddr, vmf->pmd, zero_page);
+				set_huge_zero_folio(pgtable, vma->vm_mm, vma,
+						   haddr, vmf->pmd, zero_folio);
 				update_mmu_cache_pmd(vma, vmf->address, vmf->pmd);
 				spin_unlock(vmf->ptl);
 			}
@@ -1336,9 +1337,9 @@ int copy_huge_pmd(struct mm_struct *dst_
 	 */
 	if (is_huge_zero_pmd(pmd)) {
 		/*
-		 * get_huge_zero_page() will never allocate a new page here,
-		 * since we already have a zero page to copy. It just takes a
-		 * reference.
+		 * mm_get_huge_zero_folio() will never allocate a new
+		 * folio here, since we already have a zero page to
+		 * copy. It just takes a reference.
 		 */
 		mm_get_huge_zero_folio(dst_mm);
 		goto out_zero_page;
_

Patches currently in -mm which might be from willy@infradead.org are

mm-always-initialise-folio-_deferred_list.patch
mm-create-folio_flag_false-and-folio_type_ops-macros.patch
mm-remove-folio_prep_large_rmappable.patch
mm-support-page_mapcount-on-page_has_type-pages.patch
mm-turn-folio_test_hugetlb-into-a-pagetype.patch
mm-turn-folio_test_hugetlb-into-a-pagetype-fix.patch
mm-remove-a-call-to-compound_head-from-is_page_hwpoison.patch
mm-free-up-pg_slab.patch
mm-free-up-pg_slab-fix.patch
mm-improve-dumping-of-mapcount-and-page_type.patch
hugetlb-remove-mention-of-destructors.patch
sh-remove-use-of-pg_arch_1-on-individual-pages.patch
xtensa-remove-uses-of-pg_arch_1-on-individual-pages.patch
mm-make-page_ext_get-take-a-const-argument.patch
mm-make-folio_test_idle-and-folio_test_young-take-a-const-argument.patch
mm-make-is_free_buddy_page-take-a-const-argument.patch
mm-make-page_mapped-take-a-const-argument.patch
mm-convert-arch_clear_hugepage_flags-to-take-a-folio.patch
slub-remove-use-of-page-flags.patch
remove-references-to-page-flags-in-documentation.patch
proc-rewrite-stable_page_flags.patch
sparc-use-is_huge_zero_pmd.patch
mm-add-is_huge_zero_folio.patch
mm-add-pmd_folio.patch
mm-convert-migrate_vma_collect_pmd-to-use-a-folio.patch
mm-convert-huge_zero_page-to-huge_zero_folio.patch
mm-convert-do_huge_pmd_anonymous_page-to-huge_zero_folio.patch
dax-use-huge_zero_folio.patch
mm-rename-mm_put_huge_zero_page-to-mm_put_huge_zero_folio.patch